Richard ponnay



(No Model.) 2 sheets-sheet 1.,

R. PONNAY.

SBGTIQNAL STEAM BOILBR.

No. 376,257. Patented Jan. 10, 1888.

'2 Sheets-Sheet 2.

w iugm-im! Patented Jan. 10, 1888.

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R. PONNAY.

SEGTIONAL STEAM BOILER.

UNITED STATES PATENT OFFICE.

RICHARD PONNAY, OF CHICAGO, ILLINOIS, ASSIGNOR OF TWO-THIRDS TO CHARLES H. SMITH AND JOHN HEWITT, BOTH OF SAME PLACE.

SECTIONAL STEAM-BOIVLER.

SPECIFICATION forming; part of Letters Patent No. 376,257, dated January l0, 1888.

Application filed June 15, 1886.

To all whom it may concer/n.-

Be it known that I, RICHARD PoNNAY, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sectional Steam-Boilers; and I do hereby declare that the following is a full, clear, and exact description thereof, reference b eing had to the accompanying drawings, and to the letters of reference marked thereon, which form apart of this specification.

This invention has reference to improvements in cast-iron sectional steam-boilers, and has for its object to provide a practical construction in such boilers which shall have the advantage of greater strength, fewer joints, less cost, freer circulation, and diminished liability to leakage as compared with similar structures heretofore made.

More particularly stated, the invention relates to that class ot' cast-iron sectional boilers in which the boiler is formed of a series of horizontal annular chambers having radial tubular connections between different parts of each section, and in which each section has communication with adjacent sections through suitable vertical passages formed in the casting.

Referring tothe accompanying drawings, Figure 1 is an elevation oi' a sectional boiler mounted in an upright casing or housing, which is broken away ina vertical central plane. Fig. 2 is a plan view of one ot' the boiler-sections; and Fig. 3 is a fragmentary central vertical section of a boiler containing my improvements, taken in the line x x of Fig. 2. K

A A are the several sections of the boiler, said sections being shown in the drawings arranged each in a horizontal plane and Vpiledy one above the other.

B is the housing or furnacesetting, of which C is the fire-box. v

D is the feedwaterinlet pipe.

E is the steam-supply pipe, and F is the water-gage.

Each section of the boiler consists of two annular and concentric cast chambered rings, A A2, lying in the same horizontal plane and connected wit-h each other by radial'tubes A3.

Serial No. 205,192. (No model.)

Each of the said chambered rings A A2 is circular in section, and both of said rings,together 5o with the radial connecting-tubes A3, are cast in one piece by means of suitable cores, thus avoiding all joints in the section itself.

Upon both the top and bottom of each ring A and A2 of each section are cast opposite 55 short open tubular bosses, A4, desirably of the same orncarly the same interior diameter as the rings A A2 themselves. As shown in the drawings, and as desirably constructed, four of the said bosses project from each upper and 6o lower face of the inner ring, A2, and eight from each corresponding face ofthe outer ring, A', but this number may be varied without departure from my in vention. The cast sectionsthus formed of the two rings A A2 and 65 radial connections A3 present a central vertical opening or passage, a, and other passages,"

a', bounded by the vrings and radial tubes, through which passages products of combustion may rise from the tire-box C. A space or 7c spaces are also provided external to the ring A and Within the setting B, through which said products of combustion may pass, as shown, or otherwise.

Each section A is provided with a boss or bosses, ci, cast upon its'outer periphery, some of which may be tapped to receive the connections i'or the feed and supply pipes, watergage, te., or all of them may be fitted with pipes a3, which project through the housing 83 and are plugged at their outer extremities, as shown, for the purpose of blowing out the boiler or of making additional connections as required.

rThe double annular cast section described 85 requires only to have the ends of the short open tubes A1 dressed oli' in a lathe to iit said section to be joined with others in making up a boiler, and the joints between the meeting ends of said `tubes A* of adjacent sections, gc when placed one upon the other, require only the insertion of an annular packing of paper or other suitable material to make a close and reliable joint after the sections have been properly clamped together. For the purpose of binding a suitable num ber of sections A together to form a boiler, vertical bolts G G are employed, being passed through the openings formed by the tubes A4 fromthe bottom to the top of the boiler. Suitable caps, g g', are applied to the open, upper, and lower tubes, A2 between the heads and nuts of the bolts, as plainly indicated in Fig. l.

rlhe entire boiler` is supported by the lowermost lugs or bosses, ai, resting in suitable sockets, b, placed in the setting B, or by other suitable means.

I am aware that an annular sectional cast boiler has heretofore been proposed in which each section consisted of a single hollow ring having interior cross-tubes intersecting each other centrally at right angles and extending entirely across or from side to side of each section and connecting opposite parts of the same ring, the sections being connected with each other by meeting tubes located in substantially Y the same position as shown in the accompanying drawings. Such former device differs essentially from that herein shown in the following particulars:

First. Each annular section or chamber was made in two horizontally-divided parts without the aid of acore in casting, being provided with flanges throughout the entire length of the meeting faces to receivejoining-bolts. This construction therefore presented very greatlyextended joints along both sides of the annular ring and along both sides of the radial cross connecting-tubes. This divided form of construction was objectionable not only by reason of its great cost, but also by reason ofthe practical impossibility of making these extended joints permanently tight at all points. The impairment of the joints resulted from several causes-one the unequal expansion and contraction of the two divisions or parts of which each section was made, and another the expansion and deterioration of theiiange-bol ts, which were exposed to the direct heat of the lire. Both these flange-bolts and the flanges themselves, being thus exposed to the tire at a distance from the water, soon burned out and irreparable injury followed, of course.

Second. Each section contained buta. single chambered ring, in view of which the sections so constructed were materially weakened by reason of the strain from shrinkage after casting, due to the projection of the cross-tubes entirely across the section.

A third objection to such attempted construction layin the fact that the vertical tubes through which the binding-bolts passed for holding the sections together were so small as to alford inadequate space for free circulation, and the boiler was therefore subject to foaming.

All these objections are obviated inthe construction here shown. The casting of the entire section in a single piece obviates al1 joints except the short ones between the tubes A4 of adjacent sections, materially lessens the cost of construction, and insures freedom from all defects of unequal expansion, burning out, and consequentleakage and destruction which attend the divided section and extended joints in such former structure. Moreover, the introduction of the inner annular chamber, A", making each section to consist of two concentric annular chambers or rings, and the use of only short radial tubes for the connection of the annular rings of the section with each other, and leaving a central opening, a', obviates the objection of strain from shrinkage in cooling of the metal after casting and insures greater strength in the section from this cause as well as from the absence of long joints. So, also, by making the vertical tubes A, through which the clamping-bolts G G pass, of relatively large diameter, and providing such tubes upon both the rings A A2, the utmost freedom of circulation is obtained, so that there is no liability to foaming or perverse operation from lack of due circulation between the various sections of the boiler.

Reference need not be made to various attempts to construct horizontal boilers from cast sections occupying vertical planes, inasmuch as such attempts have invariably proven futile, owing to the necessarily unequal temperatnres to which the different parts of the same section are exposed in this arrangement and to other vital objections.

My invention is restricted to an upright boiler having the sections horizontal and to the provision of wide vertical connectingtubes A4 on the inner as well as the outer of the two rings A and A2 of which each section is composed.

The sections A are all cast from the same pattern, which gives the bosses a2 on all of said sections, though actually needed upon only part of them; but their presence upon all enables the sections to be interchanged in position, it' necessary.

Having thus described the principle of my invention and pointed out wherein it is distinguished from others, I claiml. The cast double annular boilerscctiou described, composed of the chambered rings A A", connected with cach other by tubes A, and both provided on their tops and bottoms with short open tubes A, all cast in a single piece and adapted to be joined with other similar sections to form a boiler, substantially as described.

2. The combination, in a cast sectional steam-boiler, of two or more double annular sections, consisting each of the chambered rings A A", cach having tubular bosses A4 and tubular connections A, joining said rings, and vertical binding-bolts G, passing through the tubes A4, said tubes A4 being of relatively large diameter, whereby they afford free circulation from one section to another, substantially as described.

3. The cast sectional boiler composed of a IIO plurality of annular sections, A, each provided my invention I affix my signature in presence with one or more bosses a2 and vertical tubuof two Witnesses. lar-bosses At, the said bosses ai and Ai* having r the same position relative to each other in 5 the several sections, whereby the sections are IVitnesses:

interchangeable, substantially as described. M. E. DAYTON,

In testimony that I claim the foregoing as l G. F. LANAGHEN.

RICHARD PON NAY. 

